Cisco offers a variety of WDM Channel Modules (WCMs) the support line-rate connectivity for different protocols at speeds ranging from 10 Mbps to 2.5 Gbps. The WCMs for low-speed and high-speed transparent services enable users to increase bandwidth many times over without installing a new module. Line-rate specific cards for OC-12, Gigabit Ethernet, Fiber Channel, and OC-48 provide clock recovery to ensure full bandwidth operation and superior jitter interference. Each WCM contains MiniSC connectors that accept both single-mode and multi-mode fiber patch cables for interconnecting customer premise equipment (CPE). For laser safety requirements, all WCMs are equipped with an automatic shutdown (ALS), which reduces the optical output power of the remote transmitters automatically in case of a broken remote link.WDM Channel Module provides the conversion of the local or remote channels to their respective wavelengths. Channel 8 corresponds to wavelength 1547.72 nm.